Steady-State Sieving across Membranes

Bresler, E. H.; Wendt, Richard P.; Mason, Edward A.

doi:10.1126/science.172.3985.858

Cited by 16 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…(1) is negligible, i.e., if the dissolved substance is completely excluded from the membrane, one will speak of a pressure-or osmosis-induced concentration polarization. This phenomenon should play a major role especially in technical reverse osmosis (Bressler, Wendt & Mason, 1971;Schl/Sgl, 1971). It should be allowed for, however, also in the thermodynamic treatment of transport phenomena (Dainty, 1963a).…”

Section: Theorymentioning

confidence: 99%

Temporal and local concentration changes in diffusion layers at cellulose membranes due to concentration differences between the solutions on both sides of the membrane

Lerche

1976

J. Membrain Biol.

View full text Add to dashboard Cite

By means of a laser-interferometrical method diffusion layers at the interface of a noncharged cellulose membrane are studied. These layers are induced by a concentration difference between the NaCl solutions separated by the membrane. The temporal and local shift of the NaCl concentration in the diffusion layers were measured. A steady-state concentration profile could be obtained for times of 121 sec less than or equal to to less than or equal to 484 sec. The concentration profiles at any time (to less than or equal to 900) are not a linear function of the membrane surface, but could be fitted to a quadratic function. The thickness of the diffusion layers is also a function of time and its stationary value in this system is (575 +/- 49) X 10(-6)m. The role of concentration polarization for the determination of phenomenological thermodynamic coefficients of membranes is discussed and a new method is suggested, which excludes the difficulties of the concentration polarization in the diffusion layers at the membrane.

show abstract

Section: Theorymentioning

confidence: 99%

Temporal and local concentration changes in diffusion layers at cellulose membranes due to concentration differences between the solutions on both sides of the membrane

Lerche

1976

J. Membrain Biol.

View full text Add to dashboard Cite

show abstract

“…However, remarkable vertical stability of the intercalated particles (i.e. motion perpendicular to the plane of the membrane) is expected as vertical deviations would probably result in the 2 It is clear that this topological organization can include structural and functional asymmetries (7). In an 85 A particle it could also allow (although not necessarily) for the axial and terminal distribution of its hydrophilie regions which might provide a hydrophilic continuum across the membrane (Figs.…”

Section: Mip Bm Midmentioning

confidence: 99%

Translational Mobility of the Membrane Intercalated Particles of Human Erythrocyte Ghosts

Silva

1972

The Journal of Cell Biology

315

View full text Add to dashboard Cite

This paper demonstrates the translational movement aIong the plane of the human erythrocyte ghost of the membrane particles exposed by freeze-fracture. The membrane particles can be aggregated by incubation of the ghosts in media with a pI-I in the vicinity of 5 5 or 3 5. The particles are disaggregated in neutral and alkaline media (pH 9 5) and also at pH 4.5 Aggregation of the particles at pH 5.5 is reversible, prevented b,z prefixation in glutaraldehyde and by media of high ionic strength. Particle aggregation occurs within 2-4 min. These results are consistent with the concept that the erythrocyte ghost membrane is a planar fluid domain formed by a bilayer membrane continuum which is interrupted by localized, yet mobile, proteic intercalations.

show abstract

“…What we did claim was that, subject to certain simplifying but realizable conditions, the sieving properties of the array are determined by those properties intrinsic to the first membrane. Our reasoning is clearly, although perhaps tersely, set forth in our report (1) There are two views relating to this process which differ from one another in a quite fundamental way. According to the first view, sieving is regarded as taking place by an exclusion process: there is a dispersion of pore sizes with uniform particle sizes, or a dispersion of particle sizes with uniform pore sizes, or oddly shaped particles or pores (or both) so that some sor,t of lock-andkey arrangement involving proper orientation is required in order for solute to cross the membrane.…”

mentioning

confidence: 78%

Sieving Behavior of a Series Membrane System

Friedman¹,

McCally²,

Bresler³

et al. 1972

Science

View full text Add to dashboard Cite

flight. A wind-angle change in the appropriate direction would then restore activity of A fibers and increase that of B fibers. Figure 2C shows an example of just such behavior. More precise testing of this scheme has not proved fruitful due to the apparent closeness of the threshold levels of units of like size and to neuronal noise in the system. These findings argue, however, that wind-angle change has a common effect on all the follower cells in this population. It seems reasonable that wind-angle inputs may produce their effects at some common premotor point rather than at each of the 12 separate motoneurons.MAIJA HINKLE

show abstract

Steady-State Sieving across Membranes

Cited by 16 publications

References 5 publications

Temporal and local concentration changes in diffusion layers at cellulose membranes due to concentration differences between the solutions on both sides of the membrane

Temporal and local concentration changes in diffusion layers at cellulose membranes due to concentration differences between the solutions on both sides of the membrane

Translational Mobility of the Membrane Intercalated Particles of Human Erythrocyte Ghosts

Sieving Behavior of a Series Membrane System

Contact Info

Product

Resources

About